To maximize your puzzling space, click on the Maximize button in the lower right corner of the puzzle screen for fullscreen mode. Click on it again to return to normal mode.

For more tips, see the Online Puzzle Tips page.

Ohio Central Systems SD40-2 puzzle, based on an original photo by Mike Stupar (photo copyright Mike Stupar -- used with permission). Photographed at Columbus, Ohio, March 8, 2017. Click here for more information about this photograph